Ballasted Flocculation: Big Treatment, Small Footprint
Wednesday, September 30, 2026 9:00 AM to 9:30 AM · 30 min. (US/Central)
New Orleans Convention Center
Technology Spotlight
Hall H Booth 7249
Information
Ballasted flocculation has become an increasingly popular high-rate clarification technology in both water and wastewater treatment applications, municipally and industrially due to its ability to provide reliable treatment performance within a compact footprint. By utilizing microsand to increase floc density and settling velocity, ballasted flocculation systems achieve rapid solids separation with significantly reduced basin sizing compared to conventional clarification processes. This presentation will provide a high-level overview of ballasted flocculation, including how the process works, the primary system components, and the operational principles that allow for high-rate treatment.
The presentation will also discuss where ballasted flocculation is most effective and where alternative treatment technologies may be more appropriate. Advantages such as reduced capital costs, smaller space requirements, relatively simple startup, and fast installation will be reviewed with operational tradeoffs, including increased chemical usage and higher power demands associated with pumping, mixing, and solids recovery equipment.
A major focus of the presentation will be the performance under varying hydraulic and solids loading conditions. Ballasted flocculation systems perform exceptionally well during flow variability and peak wet weather events due to their short reaction times and high settling rates. Maintaining adequate continuous wasting flow is important to sustain treatment efficiency, and some performance degradation may occur during extreme hydraulic surges approaching 2x the design flow. Solids loading capabilities are often dependent on downstream solids handling equipment, and changes to pumps, hydrocyclones, or recirculation systems may be necessary as loading conditions change. Because the process relies on large available particle surface area and rapid floc formation, operators can often respond to changing influent conditions through polymer dose adjustments and operational optimization.
Finally we will cover operational considerations through chemical control, ballast recovery, equipment maintenance, and process monitoring. The presentation will conclude with a review of the applications where ballasted flocculation provides the greatest benefit, particularly for facilities facing space constraints, capacity limitations, or the need for rapid implementation of high-rate clarification systems.
The presentation will also discuss where ballasted flocculation is most effective and where alternative treatment technologies may be more appropriate. Advantages such as reduced capital costs, smaller space requirements, relatively simple startup, and fast installation will be reviewed with operational tradeoffs, including increased chemical usage and higher power demands associated with pumping, mixing, and solids recovery equipment.
A major focus of the presentation will be the performance under varying hydraulic and solids loading conditions. Ballasted flocculation systems perform exceptionally well during flow variability and peak wet weather events due to their short reaction times and high settling rates. Maintaining adequate continuous wasting flow is important to sustain treatment efficiency, and some performance degradation may occur during extreme hydraulic surges approaching 2x the design flow. Solids loading capabilities are often dependent on downstream solids handling equipment, and changes to pumps, hydrocyclones, or recirculation systems may be necessary as loading conditions change. Because the process relies on large available particle surface area and rapid floc formation, operators can often respond to changing influent conditions through polymer dose adjustments and operational optimization.
Finally we will cover operational considerations through chemical control, ballast recovery, equipment maintenance, and process monitoring. The presentation will conclude with a review of the applications where ballasted flocculation provides the greatest benefit, particularly for facilities facing space constraints, capacity limitations, or the need for rapid implementation of high-rate clarification systems.